A woman is at the movies,and she is enjoying the movie  very much. A man in the next seat begins to look for something  on the floor under him. The woman is angry (生气的)and says“What are you doing there? What are you looking for?” “A piece of chocolate巧克力. ” the man answers.“But it ’ s dirty now! Take this and be quiet, please! I am listening to the film! ” she gives the man a big one.“ But, ” the man says, “ my false ( 假的) tooth (牙齿   ) is in it on the floor地板! ”

小题1:What’s the woman doing?

小题2:Why is the woman angry?

小题3:Where is the man sitting? 

小题4:What does the woman give the man?

小题5:Why does the man want to find the chocolate?

MCS-51单片机外部中断请求信号有电平方式和______，在电平方式下，当采集到INT0或INT1的有效信号为______时，激活外部中断。